What is Shipbuilding steel plate

Shipbuilding steel plate refers to the hot-rolled steel plate produced in accordance with the requirements of the construction rules of classification societies and used for the manufacture of ship hull structures.

Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion, electrochemical corrosion of seawater and corrosion of shipbuilding organisms and microorganisms; the hull is subjected to large wind and wave shocks and alternating loads; The steel requirements for hull structure are strict. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, welding performance, processability and surface quality are required. In order to maintain the quality and ensure sufficient toughness, the Mn/C of the chemical composition is required to be above 2.5, and the carbon equivalent is also strictly required, and it is produced by a steel mill approved by the ship inspection department. Structural steel for hull is divided into strength grades according to its minimum yield point: general-strength structural steel and high-strength structural steel. Structural steel for hull is divided into general strength steel and high strength steel. General strength steel is divided into four grades A, B, D and E according to quality; high strength steel is divided into two strength grades and three quality grades; AH32, DH32, EH32, AH36, DH36, EH36.

The general-strength structural steel in the China Classification Society's standard is divided into four quality grades: A, B, C, and D (ie CCSA, CCSB, CCSC, CCSD); the high-strength structural steel in the China Classification Society's standard is three Strength levels, four quality levels.